FAGACE^ 229 



toothed toward the apex, covered below with pale or fulvous toraen- 

 tum. 19. Q. hypoleuca (E, H). 



Leaves oblong-lanceolate, entire or sinuate-dentate, dark green and 

 lustrous. 20. Q. Wislizeni (G). 



Leaves oval to oblong-obovate, rounded or acute at the apex, mostly 

 entire, with thickened revolute margins, involute in the bud. 



21. Q. myrtifolia (C). 



Leaves oval, orbicular to oblong, entire or sinuately spinose-toothed, 



convex on the upper surface ; fruit maturing at the end of the first 



season. 22. Q. agrifolia (G). 



**Stamen3 usually 6-8 ; styles dilated j abortive ovules basal or lateral ; leaves persistent, 



involute in the bud. 



Leaves oblong, acute or cuspidate, entire or dentate or sinuate-toothed, fulvous- 

 tomentose and ultimately pale on the lower surface. 23. Q. chry solepis (G, H). 

 Leaves oblong-lanceolate, acute, crenate-dentate or entire, conspicuously veined, 

 pubescent or tomentose below. 24. Q. tomentella (G). 



2. Fruit maturing at the end of the first season ; shell of the acorn glabrous on the inner 

 surface {hoary-tomentose in -^7) ; abortive ovules basal ; stamens 6-8 ; styles dilated. 

 White Oaks. 

 *Leaves and their lobes usually without bristle-tips, except on vigorous shoots, yellow- 

 green, deciduous in their first autumn or winter, convolute in the bud {conduplicate 

 in 25 and 23). 

 -t-Leaves lyrate or sinuate-pinnatifid, rarely nearly entire. 



Leaves glabrous, obovate-obloug, obliquely 3-9-lobed or pinnatifid, pale below, 

 conduplicate in the bud. 25. Q. alba (A, C). 



Leaves pubescent beneath. 



Leaves oblong-obovate, deeply lobed, usually stellate-pubescent above, pale 

 below, conduplicate in the bud. 26. Q. lobata (G) 



Leaves obovate or oblong, coarsely pinnatifid-lobed. 



27. Q. Garryana (B, G) 

 Leaves obovate or oblong-lanceolate, lobed or pinnatifid. 



28. Q. Gambelii (F) 



Leaves oblong-obovate, usually 5-lobed, stellate-pubescent above ; anthers hir 



sute. 29. Q. minor (A, C) 



Leaves entire or slightly sinuate-lobed toward the apex, oblong or oblong' 



obovate ; anthers hirsute. 30. Q. Chapmani (C) 



Leaves white-tomentulose beneath. 



Leaves obovate or oblong, lyrately pinnatifid or deeply sinuate-lobed or divided 

 cup fringed by the awned scales. 31. Q. macrocarpa (A, C) 



Leaves obovate-oblong, deeply 5-9-lobed or pinnatifid ; nut often nearly inclosed 

 in its Clip. 32. Q. lyrata (C) 



-t--*- Leaves coarsely sinuate-toothed. Chestnut Oaks. 



Fruits on peduncles much longer than the petioles ; leaves obovate or oblong- 

 obovate, generally sinuate-dentate or lobed, pubescent, and usually hoary on 

 the lower surface. 33. Q. platanoides (A, C). 



Fruits on peduncles about as long or shorter than the petioles. 



Leaves obovate or oblong-obovate, wedge-shaped or rounded at the broad 

 or narrow base, tomentose or pubescent, and often silvery white below. 



34. Q. Michauxii (A, C). 



Leaves obovate or oblong to lanceolate, acuminate, with rounded or acute 



teeth. 35. Q. Prinus (A). 



Fruits sessile or nearly so ; leaves oblong to lanceolate, acute or acuminate, or 



broadly obovate, puberulous and pale, often silvery white on the lower surface. 



36. Q. acuminata (A, C). 



